background calculation by moving average

Hi,

Let me tell you my application for  Image capture by Ximea Camera.

The background captured should be the moving average of the intensities  and change the value of the next background depending on the intensities of the following images .

Let me problem statement in the word doc named camera.docx.

I am unable to proceed for a moving array or shift register .

Could you please look my answer. and suggest a solution?

Thanks  a Lot